JPH02170077A - digital video processing circuit - Google Patents

Abstract

PURPOSE:To vary the characteristics of video displayed on a CRT optionally and to improve the visibility greatly by adding a data converting circuit. CONSTITUTION:Quantized digital video 5 is inputted to a data converting circuit 7 and a mode select signal 8 is selected to perform conversion for input so that the best video characteristics, wherein, for example, a level difference nearby a saturation is emphasized, corresponding to the circumstances are obtained. Then, data of one sweep are stored in an input buffer 1 and stored in an image memory 2. When the data are read out, data of one scan is read out of the memory 2, stored in a output buffer 3, and sent to an output controller 4, and the data is D/A-converted and outputted as display video 6. The characteristics of the video displayed on the CRT can be varied optionally, so the visibility is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital video processing circuit in a radar display device that performs raster scan display.

[Conventional technology]

Conventionally, there has been a circuit of this type as shown in FIG.

In the figure, 1 is an input sofa, 2 is an image memory for storing digital video data, 3 is an output sofa, 4 is an output controller, 5 is a digital video, and 6 is a display video.

The principle is "radar technology" (Institute of Electronics, Information and Communication Engineers) P
2O3, according to Figure 7.11.

Next, the operation of the circuit shown in FIG. 3 will be explained. The quantized digital video 5 stores one sweep's worth of data in the input buffer 1. The stored data is sequentially written into the image memory 2. When reading data, data for one scanning line is read from the image memory 2, this data is stored in the output sofa 3, and the data is sent to the output controller 4.
/A conversion and output as display video 6.

[Problem to be solved by the invention]

Conventional circuits were configured as described above, and only fixed corrections were made to the input digital video, so when the input digital video became saturated, the display on the CRT There was a problem that it became difficult to see.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a digital video processing circuit that can improve visibility.

[Means to solve the problem]

The digital video processing circuit according to the present invention improves visibility on a CRT by setting an arbitrary amount of change in the input digital video by using a data conversion circuit.

[Effect]

The data conversion circuit according to the present invention performs data conversion of an arbitrary level on input digital video according to arbitrarily set output data.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1. 2. 3. 4. 5. 6 is the same or equivalent portion as in FIG. 4. 7 is a data conversion circuit, and 8 is a data mode selection signal.

Next, the operation will be explained.

The quantized digital video 5 is first input to the data conversion circuit 7. This data conversion circuit 7 selects the mode selection signal 8 to select the most appropriate video characteristics for the input digital video according to the situation, such as emphasizing the level difference of the video near the saturation level. The conversion is performed so that the video characteristics are the same.

After that, data for one sweep is stored in the input cover sofa 1. The stored data is sequentially written into the image memory 2. Next, in reading, data for one scanning line is read out from the image memory 2, stored in the output sofa 3, sent to the output controller 4, subjected to D/A conversion, and outputted as a display video 6.

As described above, in this embodiment, by adding a data conversion circuit, the characteristics of the video displayed on the CRT can be arbitrarily changed, so that visibility can be greatly improved.

In the above embodiment, the data conversion circuit 7 is used to convert digital video data, but an arithmetic unit and a variable input device may be used instead.
Another embodiment of the present invention in this manner is shown in FIG.

In FIG. 2, the digital video 5 stores data for one sweep in the input sofa 1. The stored data is sequentially written into the image memory 2. On the other hand, based on the variable data 11 input by the variable input device 10, the arithmetic device 9 reads out the data written in the image memory 2, and the arithmetic device 9 performs arithmetic operations on the data according to the variables 11. The data is converted and written into the image memory 2 again. Next, during reading, data for one scanning line is read from the image memory 2, stored in the output sofa 3, and further sent to the output controller 4, subjected to D/A conversion, and outputted as a display video 6. In this way, the variable input device 10
The arithmetic unit 9 has a function equivalent to inputting the data mode selection signal 8 in the embodiment of
It has a function equivalent to .

〔Effect of the invention〕

As described above, according to the present invention, since the digital video processing circuit is configured to perform data conversion of digital video, it is possible to improve visibility.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a digital video processing circuit according to one embodiment of the invention, FIG. 2 is a circuit diagram of another embodiment of the invention, and FIG. 3 is a circuit diagram of a conventional digital video processing circuit. 1... Inner cover sofa, 2... Image memory, 3...
Output sofa, 4... Output controller, 7... Data conversion circuit. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A digital video processing circuit in a radar display device that performs raster scan display, characterized in that the digital video processing circuit is equipped with a data conversion circuit that converts input digital video into data and provides a desired amount of data change.